National Dex OU
Latias-Mega @ Latiasite
Ability: Levitate
EVs: 252 HP / 4 Def / 80 SpD / 172 Spe
Timid / Calm Nature
- Calm Mind
- Stored Power / Psyshock
- Aura Sphere
- Recover
Calm Mind is set-up. Stored Power is STAB and gets stronger every time Calm Mind is used, and with M-Latias's great bulk and all the balance flying around, it doesn't have a hard time setting up and sweeping. Psyshock, on the other hand, lets Mega Latias do more damage to Calm Mind users like Reuniclus and Clefable, and ensures the best Pokemon in the tier, Heavy-Duty Boots Blissey, won't be around to wall it. Aura Sphere is
for KOing Dark types like Weavile, Tyranitar, and the incredibly dangerous Specs Ash-Greninja (which it can easily set up on if it locks itself into Hydro Pump or Spikes), and Nasty Plot Hydreigon which are Dark types and therefore are completely unaffected by Stored Power or Psyshock. Aura Sphere also hits the Steel types resistant to your Psychic STAB, which lets it break past Ferrothorn and do decent damage to Mega Scizor. Recover keeps Mega Latias healthy.
Natures: Timid lets Latias outspeed Hydreigon, while Calm ensures it will never be OHKOed by Hydreigon's +2 Dark Pulse.
252 SpA Choice Specs Greninja Dark Pulse vs. 252 HP / 80 SpD Latias-Mega: 222-264 (60.9 - 72.5%) -- guaranteed 2HKO
+2 220 SpA Hydreigon Dark Pulse vs. 252 HP / 80+ SpD Latias-Mega: 302-356 (82.9 - 97.8%) -- guaranteed 2HKO
+1 0 SpA Latias-Mega Aura Sphere vs. 8 HP / 28 SpD Hydreigon: 244-288 (74.6 - 88%) -- 6.3% chance to OHKO after Stealth Rock
+1 0 SpA Latias-Mega Psyshock vs. 252 HP / 196+ Def Clefable: 160-190 (40.6 - 48.2%) -- guaranteed 3HKO
+2 +2 SpD 0 SpA Latias-Mega Stored Power (100 BP) vs. 252 HP / 4 SpD Clefable: 313-369 (79.4 - 93.6%) -- guaranteed 2HKO after Leftovers recovery